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In Reply to: Re: Craftsman 917258873 /Koehlor 18hp will not start posted by Matt on Tuesday, September 01, 2009:
Went to sears website & looked at elect parts drawing for tractor,start circuit is usually wired thru clutch/brake sw & pto sw,the seat sw usually only affects eng ign,contacts in seat sw close when not sitting on seat,this ign kill circuit also runs thru brake/clutch & pto sw,if you engage clutch/pto & not sitting on seat,ign grounded thru seat sw,stopping eng(acts the same as turning ign sw to off/stop)the +12 volts to starter sol also runs thru clutch/brake & pto sw so you can't start eng with clutch/pto engaged,this is how a normal circuit works,however looking at elect parts drawing,tractor has a plug in relay behind dash or in wiring harness,I suspect clutch/pto sw operate this relay & feed +12 to sol coil,the click you hear may be this relay & not starter sol,contacts in same may be bad,locate relay & try jumping/bypassing relay & see if sol/starter work.
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